Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddee0b51cc8cb726…

MALICIOUS

PDF

82.5 KB Created: 2021-10-05 04:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74359570635116ab0b51b7316e2d12d5 SHA-1: 5409ac09bd351e617022c89ee7ffe2836e6b4f2a SHA-256: ddee0b51cc8cb726d3dbe9e06eb68afd9acb07a1d30ec07cbc433c30b2bea503
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=how+to+cite+interviews+chicago PDF link annotation
    • https://wronba.pl/uploads/wysiwyg/file/tazenawitomalupew.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/43358115411.pdfIn PDF document text
    • https://clinicscrm.com/img/files/linobememikezevuneg.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/gekawumojudidijigabedago.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210916234326.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/wiwawuvogi.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/bovuk.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/57239622904.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210930200139_1590067842.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b125e062cf---75024963928.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/xexelowanofev.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219201833408799.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/nafibug.pdfIn PDF document text
    • http://freeski.hu/freeski/file/nativawutularifogewinakep.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/64620465182.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/32234411918.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/fajitufogofaguwevure.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/44787886991.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/29421091392.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/gixokolabewosizinimuji.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/28311504577.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/kidaxinevusij.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/80912783431.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/lejubolilubabukozej.pdfIn PDF document text
    • http://hak-al.com/resimler/files/lemunedodiruwero.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/45324432653.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10608 bytes
SHA-256: 81b369a91f13e9703af7c86b8e142f99c4d34386c3c0192e711a9fd202ea6912
font_02_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 19028 bytes
SHA-256: d2dd1636f1906fc052e75c0642abcc72be77e0c892c67436a4a9b289da631fbb